Great read. My favorite part is this bullet point:

> Use npm scripts so people don’t have to understand or globally install any build tools

I do this on every project I work on. In fact, where possible, I completely skip globals entirely (for instance in my msngr.js library it uses Grunt but it executes grunt locally without it being installed globally on the machine).

I think it's really important that anyone can go up to a library, pull it down, and start it with little to no further effort. The less friction you can provide a developer the better.